How to use ImportC to import WebGPU header
I would like to use ImportC to automatically import a C header
into my D project. I've been using Dstep so far which works ok,
but requires some manual fixes to get the resulting D file to
compare and it doesn't let me to just drop the C header file.
I created a fresh dub project to try. I try to import this header
https://github.com/webgpu-native/webgpu-headers/blob/main/webgpu.h . I put webgpu.h file next to app.d.
My code is:
```
import std.stdio;
import webgpu;
void main()
{
}
```
it builds.
Then I tried to output one of the enums to see if it works:
```
import std.stdio;
import webgpu;
void main()
{
writeln(WGPUBlendFactor_Dst);
}
```
and it says:
Starting Performing "debug" build using
C:\D\dmd2\windows\bin64\dmd.exe for x86_64.
Building test_importd ~master: building configuration
[application]
source\app.d(6,10): Error: undefined identifier
`WGPUBlendFactor_Dst`
Error C:\D\dmd2\windows\bin64\dmd.exe failed with exit code 1.
I tried to do the other commandline but I get this error instead:
C:\Users\haxx\Desktop\dev\test_importd\source>dmd -c webgpu.c
-Hf=webgpu.di
C:\D\dmd2\windows\bin64\..\..\src\druntime\import\importc.h(134):
fatal error C1034:
sal.h: no include path set
Error: C preprocess command C:\Program Files (x86)\Microsoft
Visual
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\cl.exe failed for file
webgpu.c, exit status 2
WASM - Passing JS objects to D
What is the recommended way to pass JS objects to D when doing
WASM?
My current solution is to maintain an ID <-> object mapping in
JS, something like:
const mapJsToHandle = new WeakMap();
const mapHandleToJs = {};
var id = 0;
const toHandle = (x) => {
if (!mapJsToHandle.has(x))
{
id++;
mapJsToHandle.set(x, id);
mapHandleToJs[id] = new WeakRef(x);
return id;
} else {
return mapJsToHandle.get(x);
}
};
const fromHandle = (x) => {
return mapHandleToJs[x].deref();
};
which I can use like:
const drawJS = (imghandle, x, y) => {
document.ctx.drawImage(fromHandle(imghandle), x, y);
}
var img = new Image();
drawImage(toHandle(img))
D code
extern(C) void drawImage(int imghandle)
{
draw(imghandle, 100, 100);
}
void drawJS(int imghandle, double x, double y);
This works. But I wonder if there's some easier/better way? If I
understand correctly you can only pass primitive objects and
arrays across the boundaries.
Re: Make IN Dlang
On Tuesday, 1 November 2022 at 23:40:22 UTC, Christian Köstlin
wrote:
sh("touch %s".format(t.name));
One of the problems of many Make-like tools is that they offer
lots of freedom, especially when allowing you to launch arbitrary
shell commands. But this also comes with drawbacks, because this
touch command will instantly break Windows builds, might also be
a problem on some non-Linux platforms like macOS. Declarative
approach from tools like dub might be restrictive, but it also
lets me as a user know that I can download an arbitrary dub
project and 99% chance it will just compile out of the box on
Windows.
Re: How do I correctly install packages for use with Visual Studio?
On Sunday, 16 October 2022 at 11:09:31 UTC, Decabytes wrote: It's a double whammy because I've never used Visual Studio before (Just an Emacs Guy), but I need to debug my D programming and according to the [documentation](https://wiki.dlang.org/Debuggers) this is my only option on Windows. I am using Visual Studio Code with code-d plugin and using the standard C++ debugger. Seems to work well enough. Some D-specific constructs like AA look weird at times, but breakpoints work, shows me values of variables, callstacks.
How to make a generic function to take a class or struct by reference?
I would like to have only one definition of getX if possible,
because they both are doing the same thing. I can't remove the
ref one, because without a ref it will pass the struct as a
temporary and compiler won't like that.
```d
import std.stdio;
struct Foo
{
int x;
void doStuff()
{
*getX(this) = 5;
}
}
class Bar
{
int x;
void doStuff()
{
*getX(this) = 5;
}
}
int* getX(T)(ref T t)
{
return
}
int* getX(T)(T t)
{
return
}
void main()
{
Foo foo;
Bar bar = new Bar();
foo.doStuff();
bar.doStuff();
assert(foo.x == 5);
assert(bar.x == 5);
}
```
Re: Improve a simple event handler
On Saturday, 15 January 2022 at 23:15:16 UTC, JN wrote:
Is there some way I could improve this with some D features? My
main gripes with it are:
Managed to dramatically simplify it to 10 lines of code with
variadic templates.
```d
import std.stdio;
struct Event(T...)
{
void function(T)[] listeners;
void addListener(void function(T) handler)
{
listeners ~= handler;
}
void emit(T args)
{
foreach (listener; listeners)
{
listener(args);
}
}
}
void onResize(uint newWidth, uint newHeight)
{
writefln("Resized: %d %d", newWidth, newHeight);
}
void main()
{
Event!(uint, uint) windowResizeEvent;
windowResizeEvent.addListener();
windowResizeEvent.emit(1000, 2000);
}
```
I am very happy with this solution.
Improve a simple event handler
I am writing a simple event handler object for observer pattern. https://gist.github.com/run-dlang/d58d084752a1f65148b33c796535a4e2 (note: the final implementation will use an array of listeners, but I want to keep it simple for now and have only one handler per event). Is there some way I could improve this with some D features? My main gripes with it are: 1) generic typing. I wish event handler methods such as onResize and onWindowTitle could take concrete types like WindowResize and WindowTitle rather than the generic Event struct. 2) same when emitting the event. It feels a bit verbose. I don't want to use classes or polymorphism. I was thinking perhaps std.variant could be useful here, although I am not exactly sure how it would work in practice.
How to make a function that accepts optional struct but can accept struct literal too
Is there some nice way of achieving something like this C99 code
in D?
```c
#include
typedef struct {
int x, y;
} inputs_t;
void foo(inputs_t* optional_inputs)
{
if (!optional_inputs) {
printf("0 0\n");
} else {
printf("%d %d \n", optional_inputs->x,
optional_inputs->y);
}
}
int main(void) {
foo(NULL); // prints 0 0
foo(&(inputs_t){.x = 5, .y = 6}); // prints 5 6
}
```
below code won't work. Yes, I know I can just use a local
variable in this case and pass a pointer, but I'd like to get it
to work with literal structs too.
```d
import std.stdio;
struct inputs_t {
int x, y;
};
void foo(inputs_t* optional_inputs)
{
if (!optional_inputs) {
writeln("0 0");
} else {
writeln(optional_inputs.x, optional_inputs.y);
}
}
void main() {
foo(null); // prints 0 0
foo(&(inputs_t(5, 6))); // error: inputs_t(5,6) is not an
lvalue and cannot be modified
}
```
Why sometimes stacktraces are printed and sometimes not?
What makes the difference on whether a crash stacktrace gets printed or not? Sometimes I get a nice clean stacktrace with line numbers, sometimes all I get is "segmentation fault error -1265436346" (pseudo example) and I need to run under debugger to get the crash location.
Re: Looking to get typeof parseXML return value
On Tuesday, 7 September 2021 at 04:13:08 UTC, Chris Piker wrote: Like almost all new users to D I'm tripping over how to save and pass around variables since nothing has an understandable type anymore and you can't use "auto" for *class member* storage types. I struggle with this often. Templated types that pretty much require you to use auto look nice on the paper and in samples, but once you try to integrate them into a larger project, it can get messy.
Any UML generators for D code?
I'd like to see the relationships between my D classes in a graphical form. Is there any tool that supports that?
Detect if a struct is a 3-float vector
I'm looking for a way to test a struct for these conditions:
1. has members named x, y and z
2. these members are floating point type
This works, but feels kinda verbose, is there some shorter way?
Can I somehow avoid the hasMember/getMember calls?
```d
import std.traits;
struct Vector3f
{
float x, y, z;
}
struct Vector2f
{
float x, y;
}
struct Vector3i
{
int x, y, z;
}
bool isVector3fType(T)()
{
static if (__traits(hasMember, T, "x") && __traits(hasMember,
T, "y") && __traits(hasMember, T, "z"))
{
static if (isFloatingPoint!(typeof(__traits(getMember, T,
"x")))
&& isFloatingPoint!(typeof(__traits(getMember, T,
"y")))&& isFloatingPoint!(typeof(__traits(getMember, T, "z" {
return true;
}
}
return false;
}
void main()
{
static assert(isVector3fType!Vector3f);
static assert(!isVector3fType!Vector2f);
static assert(!isVector3fType!Vector3i);
}
```
Arrays of variants, C++ vs D
This C++ code compiles:
```cpp
#include
#include
#include
int main()
{
using Foo = std::variant;
std::map foos = {{0, "abc"}, {1, 5}};
}
This code doesn't:
```d
import std.variant;
void main()
{
alias Foo = Algebraic!(int, string);
Foo[int] foos = [
0: "abc",
1: 5
];
}
```
but this does:
```d
import std.variant;
void main()
{
alias Foo = Algebraic!(int, string);
Foo[int] foos = [
0: Foo("abc"),
1: Foo(5)
];
}
```
Why does D need the explicit declarations whereas C++ can infer
it?
Re: Cast class reference to pointer of another class?
On Saturday, 29 May 2021 at 22:26:48 UTC, ag0aep6g wrote: You're writing @system code, so dangerous casts are allowed. It's no surprise that the code compiles. If you want to be safeguarded against such things, use @safe. The result is a class object being reinterpreted as a struct object. Usually, that's just nonsense. But it might be useful for some expert who wants to tinker with the object's internals. I have to disagree. I don't see a good reason for this behavior and it's just one more thing to trip people. I think it'd be better if such thing was done explicit, something like: ```d Bar b = new Bar(); Foo* f2 = cast(Foo*)b.ptr; ```
Re: Cast class reference to pointer of another class?
fixed formatting:
```d
struct Foo
{
}
class Bar
{
}
void main()
{
Bar b = new Bar();
Foo* f = cast(Foo*)b;
}
```
Cast class reference to pointer of another class?
```struct Foo
{
}
class Bar
{
}
void main()
{
Bar b = new Bar();
Foo* f = cast(Foo*)b;
}```
this code compiles. Why? What is even the result in "f" in this
case?
Re: Why is this allowed? Inheritance variable shadowing
On Tuesday, 13 August 2019 at 04:40:53 UTC, Chris Katko wrote:
You can drop this straight into run.dlang.io:
import std.stdio;
class base{ float x=1;}
class child : base {float x=2;} //shadows base variable!
void main()
{
base []array;
child c = new child;
array ~= c;
writeln(c.x); //=2
writeln(array[0].x); //=1 //uses BASE's interface, yes,
//but why does the CHILD instance one exist at all?
}
Just got bitten by this. When copy pasting code of a bigger
class, it's easy to miss the redefinition of variable.
Is there any viable usecase for this behavior? I am not buying
the "C++ does it and it's legal there" argument. There's a reason
most serious C++ projects use static analysis tools anyway. D
should be better and protect against dangerous code by default. I
think a warning in this case would be warranted.
Re: Compiler version "dirty"
On Tuesday, 9 March 2021 at 01:36:18 UTC, Paul Backus wrote: On Monday, 8 March 2021 at 22:29:58 UTC, Q. Schroll wrote: When I enter `dmd --version`, it says: DMD64 D Compiler v2.095.1-dirty What should the "dirty" mean? To me, it seems looks something went wrong somewhere. It means someone made a mistake when preparing the release. Probably harmless. v2.096.1 also reports as -dirty
Struct initialization extra comma - should it compile
struct Foo
{
int x, y, z;
}
void main()
{
Foo bar = Foo(1,);
}
This compiles without syntax errors, is this expected?
Re: Foo Foo = new Foo();
On Sunday, 21 February 2021 at 18:09:29 UTC, FeepingCreature
wrote:
On Sunday, 21 February 2021 at 18:07:49 UTC, JN wrote:
class Foo
{
}
void main()
{
Foo Foo = new Foo();
}
this kind of code compiles. Is this expected to compile?
Yes, why wouldn't it? main is a different scope than global;
you can override identifiers from global in main. And "Foo"
only exists after the declaration, so it doesn't conflict.
I was worried I hit some corner case where it compiles even
though it shouldn't. Can lead to some confusing code. I guess D
is smart enough to figure out which is a type and which is a
variable. C++ gets confused in similar situation.
Re: How add png image to zip file using std.zip?
On Sunday, 21 February 2021 at 17:17:56 UTC, Marcone wrote:
ZipArchive zip = new ZipArchive();
std.file.write("foo.zip", zip.build());
ArchiveMember f = new ArchiveMember();
f.name = "Wallpaper_001.png";
zip.addMember(f);
std.file.write("foo.zip", zip.build());
File is added with file size 0.
How can I use expandedData for add images files? Or what I use
for it?
expandedData should hold the contents of the uncompressed file,
as byte array. So something like:
f.name = "Wallpaper_001.png";
f.expandedData = cast(ubyte[])std.file.read("Wallpaper_001.png");
should work. f.name = "Wallpaper_001.png" only says "create a
file named Wallpaper_001.png inside the zip". It doesn't say "put
the Wallpaper_001.png file into the zip".
Foo Foo = new Foo();
class Foo
{
}
void main()
{
Foo Foo = new Foo();
}
this kind of code compiles. Is this expected to compile?
Any tools to track heap/stack corruptions?
I am dealing with some nasty issue in my code. Basically random unrelated lines of code are crashing with access violations, and if I switch from dmd to ldc the crash goes away, or crash comes back, or it crashes in a different spot. Seems like I am corrupting some memory somewhere (I interact a lot with C libraries). Do you know of any tools I could use to try to narrow it down? I've used Application Verifier but so far it didn't point me to anything specific.
Re: Refactoring tools
On Wednesday, 3 February 2021 at 07:20:06 UTC, Imperatorn wrote:
2. If not, why? (Is D still too small?)
D uses templates and a lot of code is generated at compile time.
It's the same reason C++ doesn't have any advanced refactoring
tools like e.g. Java does. In Java, it's simple to rename a class
in all files that use it, and the tools know that X class is
actually the class from module A and not the X class from module
B. In D, for all you know you could have someone using
mixin("My"~"Class"), good luck automatically renaming that.
Re: How to resize an image ? 樂
On Friday, 25 December 2020 at 20:59:03 UTC, vnr wrote: Hello For a small "script" that generates printable files, I would need to change the size of an image (which is loaded into memory as an array of bytes) to shrink it to scale if it exceeds the A4 page size. To load the images into memory and generate a PDF, I use the "printed" package. It is not very provided but is sufficient for my use, I just need the resize option... Is there a relatively simple way to do this? Thank you. I use the trusty stb_image C libraries (bindings here https://code.dlang.org/packages/stb ), specifically the stbir_resize_* functions.
Why are default template parameters not permitted on class templates?
class ValueHolder(T = int)
{
T t;
}
void main()
{
ValueHolder!int v1;
ValueHolder v2; // error
}
onlineapp.d(9): Error: template class onlineapp.ValueHolder(T =
int) is used as a type without instantiation; to instantiate it
use ValueHolder!(arguments)
Re: Resolve dub dependency
On Monday, 21 September 2020 at 19:38:12 UTC, Paul Backus wrote: On Monday, 21 September 2020 at 19:16:17 UTC, JN wrote: I am trying to use bindbc-sdl and bindbc-wgpu at the same time. The error is: Unresolvable dependencies to package bindbc-loader: bindbc-sdl 0.19.1 depends on bindbc-loader ~>0.3.0 bindbc-sdl 0.19.1 depends on bindbc-loader ~>0.3.0 bindbc-wgpu 0.1.0-alpha8 depends on bindbc-loader ~>0.2.1 What is the cleanest way to resolve this? I don't understand why can't -sdl and -wgpu use different versions of the loader library. You can't use different versions of a library in the same library in the same program because library version isn't included in name mangling, so you'll get link errors for having multiple definitions of the same symbol. Ahh ok, that makes sense. I patched bindbc-wgpu locally to use loader ~>0.3.0 and it's working now.
Resolve dub dependency
I am trying to use bindbc-sdl and bindbc-wgpu at the same time. The error is: Unresolvable dependencies to package bindbc-loader: bindbc-sdl 0.19.1 depends on bindbc-loader ~>0.3.0 bindbc-sdl 0.19.1 depends on bindbc-loader ~>0.3.0 bindbc-wgpu 0.1.0-alpha8 depends on bindbc-loader ~>0.2.1 What is the cleanest way to resolve this? I don't understand why can't -sdl and -wgpu use different versions of the loader library.
Autodecode?
Related to this thread: https://forum.dlang.org/post/xtjzhkvszdiwvrmry...@forum.dlang.org I don't want to hijack it with my newbie questions. What is autodecode and why is it such a big deal? From what I've seen it's related to handling Unicode characters? And D has the wrong defaults?
Re: What would be the advantage of using D to port some games?
On Wednesday, 24 June 2020 at 18:53:34 UTC, matheus wrote: Hi, I currently use D for small CLI/Batch apps, before that I used to program in C. Despite of using D I usually program like C but with the advantage of: GC, AA, CTFE and a few classes here and there. As we can see there are a lot of old classic games source available like: DOOM, Duke Nukem 3D, Red Alert and most them written originally in C/C++. What I'd like to know from the experts is: What would be the advantage of using D to port such games? Thanks in advance, Matheus. The advantage is that you have a fun programming project and a challenge. And you don't have to worry about being stuck on the code or art side, because all those are ready for you, you just have to rewrite it in a different language. Also, when finished, it makes for a fun blog post about challenges of porting C/C++ code to D and which parts were simplified using D features. I was thinking of porting something like Doom to D also (DooD?), but never got around to it. I guess one could start with a betterC port too.
Re: Send empty assoc array to function
On Friday, 10 July 2020 at 03:59:37 UTC, Mike Parker wrote: Meh. You could say the same about foo(int[]), or foo(SomeClass). AAs are reference types. Reference type instances can be null. Oh, that actually makes sense. I always thought assoc arrays are value types. Anyway, even if they are reference type, I still would consider [] and null different types of values. [] conveys to me that the object exists, but is empty. null conveys to me that the object exists and cannot be used. int[int] a = null; a[5] = 6; This kind of code just looks weird... yes, I know the " = null " part is excessive, but still.
Re: Send empty assoc array to function
On Thursday, 9 July 2020 at 20:24:11 UTC, Steven Schveighoffer
wrote:
On 7/9/20 4:04 PM, JN wrote:
On Thursday, 9 July 2020 at 19:53:42 UTC, JN wrote:
void foo(int[int] bar)
{
// ...
}
Is it possible to send an empty array literal?
foo( [ 0 : 2 ] ) works
foo( [] ) doesn't
int[int] empty;
foo(empty);
works but it's two lines
Hmm, foo(null) seems to work, but is it correct way to do it?
Yes, that is correct.
-Steve
Interesting. Often in D discussion, an argument pops up that the
language should be protecting against hidden breakages from API
changes. This would be an example of that happening.
void foo(int[int] bar), someone calls it with a null, suddenly
the signature changes to void foo(int* bar) and you will be
sending a null pointer and possibly breaking the app.
Re: Send empty assoc array to function
On Thursday, 9 July 2020 at 19:53:42 UTC, JN wrote:
void foo(int[int] bar)
{
// ...
}
Is it possible to send an empty array literal?
foo( [ 0 : 2 ] ) works
foo( [] ) doesn't
int[int] empty;
foo(empty);
works but it's two lines
Hmm, foo(null) seems to work, but is it correct way to do it?
Send empty assoc array to function
void foo(int[int] bar)
{
// ...
}
Is it possible to send an empty array literal?
foo( [ 0 : 2 ] ) works
foo( [] ) doesn't
int[int] empty;
foo(empty);
works but it's two lines
Re: Why is this allowed
On Wednesday, 1 July 2020 at 15:57:24 UTC, Nathan S. wrote:
On Tuesday, 30 June 2020 at 16:22:57 UTC, JN wrote:
Spent some time debugging because I didn't notice it at first,
essentially something like this:
int[3] foo = [1, 2, 3];
foo = 5;
writeln(foo); // 5, 5, 5
Why does such code compile? I don't think this should be
permitted, because it's easy to make a mistake (when you
wanted foo[index] but forgot the []). If someone wants to
assign a value to every element they could do foo[] = 5;
instead which is explicit.
What's your opinion on using that syntax in the initial
declaration, like `float[16] foo = 0`?
I don't like it. I'd prefer:
float[16] foo = [ 0 ];
or
float[16] foo = { 0 };
or
float[16] foo(0);
Re: Print only part of a stack trace
On Wednesday, 1 July 2020 at 18:30:15 UTC, Dennis wrote:
I have a function that checks a global error constant of a C
library (OpenGL) like this:
```
void assertNoOpenGLErrors() {
if (glGetError() != GL_NO_ERROR) {
assert(0); // stack trace points to here instead of
caller
}
}
Bit off-topic, but if you can use them, debug contexts offer much
better OpenGL error-checking experience.
https://www.khronos.org/opengl/wiki/Debug_Output . Instead of
checking glGetError() after each call, you can setup a C callback
that will trigger whenever an error occurs. It also offers some
vendor-specific performance warnings.
Re: Why is this allowed
On Tuesday, 30 June 2020 at 16:37:12 UTC, Steven Schveighoffer wrote: That's a feature. I don't think it's going away. The problem of accidental assignment is probably not very common. -Steve What is the benefit of this feature? I feel like D has quite a few of such "features". I like my code to be explicit, even at a cost of some extra typing, rather than get bitten by some unexpected implicit behavior.
Why is this allowed
Spent some time debugging because I didn't notice it at first, essentially something like this: int[3] foo = [1, 2, 3]; foo = 5; writeln(foo); // 5, 5, 5 Why does such code compile? I don't think this should be permitted, because it's easy to make a mistake (when you wanted foo[index] but forgot the []). If someone wants to assign a value to every element they could do foo[] = 5; instead which is explicit.
Use classes as keys in associative array
Is it possible to use different class instances as keys for
associative array, but compare them by the contents? I tried to
override opEquals but it doesn't seem to work. Basically I'd like
this code to work. I know structs would work but I can't use
structs for this):
import std.stdio;
class Name
{
string s;
this(string s)
{
this.s = s;
}
}
void main()
{
Name n1 = new Name("John");
Name n2 = new Name("John");
int[Name] ages;
ages[n1] = 50;
assert(ages[n2] == 50);
}
Re: Determining @trusted-status
On Friday, 29 May 2020 at 00:09:56 UTC, Clarice wrote: It seems that @safe will be de jure, whether by the current state of DIP1028 or otherwise. However, I'm unsure how to responsibly determine whether a FFI may be @trusted: the type signature and the body. Should I run, for example, a C library through valgrind to observe any memory leaks/corruption? Is it enough to trust the authors of a library (e.g. SDL and OpenAL) where applying @trusted is acceptable? There's probably no one right answer, but I'd be very thankful for some clarity, regardless. I think most C FFI should be @system, even if it's for popular libraries like SDL. Whenever you have API that takes a pointer and a size of array, you are risking buffer overflows and similar issues. It's very easy to mess up and send array length instead of array length * element.sizeof. A @trusted API would only accept a slice, which is much safer than raw pointers. Alternatively you could just use @trusted blocks. Unsafe blocks are a common practice in languages like C# or Rust when it comes to calling unsafe code. @safe isn't about 100% bulletproof safety. @safe is (should be) about not having memory related errors outside of @trusted code, minimizing the surface area for errors.
Re: How to include my own library in my d program with dub ?
On Thursday, 14 May 2020 at 12:53:43 UTC, Vinod K Chandran wrote: Hi all, I just build a skeleton of a Gui library(win32 based) for my own purpose. How do i use this in my d programs with dub ? Now, all files are located in a folder called "GuiLib". Side note : Why i started making a gui library instead of learning language ? Answer : By this way, i can learn the language and i will have my own gui library. Otherwise, i would have struggle with learning a third party library. I don't know if it's up-to-date, but this should work: https://github.com/dlang/dub/wiki/Cookbook#working-with-submodules-or-packages-that-are-not-in-the-registry I am assuming your GUI library uses dub already for building?
Re: Is there an exception for access violation on LDC/win64?
On Monday, 13 April 2020 at 10:18:17 UTC, realhet wrote: Hi, import std.stdio, std.exception; [...] Running under the debugger should show you the location of the crash.
Re: Discord bot written in D
On Monday, 6 April 2020 at 21:23:22 UTC, Quantium wrote: Are there any libraries to creade a simple discord bot using D? And if you know these libraries, could you day me their pros and cons? There are four Discord API related libraries on code.dlang.org. Have you checked those?
Re: Vibe.d navigation
On Tuesday, 31 March 2020 at 18:57:51 UTC, GreatSam4sure wrote: I am playing with the vibe.d for some days now. One thing I am struggling with is move from one page to another using web interface. The naming of the functions and proper navigation from one page to another is not clear to me. How to move from one page to another. I will appreciate any help. https://vibed.org/api/vibe.web.web/redirect
Cool name for Dub packages?
Do we have any cool name for Dub packages? Rust has 'crates' Crystal has 'shards' Python has 'wheels' Ruby has 'gems'
Re: in not working for arrays is silly, change my view
On Saturday, 29 February 2020 at 21:56:51 UTC, Ali Çehreli wrote: Because you mentioned canFind, I think you want the semantics to be "is there an element with this value." If so, it would be confusing to use the same operator for two different things: For associative arrays, it means "is there an element accessible with this key." Does it? I always viewed it as "is this value in list of keys" Unless 'in' works with arrays to mean "is this index valid", then I don't see the benefit. If we had it, I think more people would ask "why does 'in' work differently for arrays?" Are there other languages that support this semantic? Checking... Ok, Python has it, highly likely because they don't have arrays to begin with. Well, Python lists are for most purposes equivalent to arrays and it hasn't really been confusing for people.
in not working for arrays is silly, change my view
assert(1 in [1, 2, 3]); Error: incompatible types for (1) in ([1, 2, 3]): int and int[ Yes, I know about .canFind(), but this is something that trips people over and over. I think it would be better if "in" worked for both assoc arrays and normal arrays, or didn't work at all, for added consistency.
Re: Where are the GSOC 2020 ideas?
On Thursday, 27 February 2020 at 08:16:32 UTC, mark wrote: On https://wiki.dlang.org I can find GSOC ideas 2011-2019, but not 2020. I know the 2020 one's haven't been accepted, but I'd like to know what they are in case I feel like having a go at one as part of learning D. I don't know where is the official list, but this list may have been used for thinking up GSOC 2020 projects: https://github.com/dlang/projects/issues?q=is%3Aissue+is%3Aopen+label%3Agsoc2020
Re: Lambda capture by value
On Monday, 24 February 2020 at 20:00:20 UTC, Adam D. Ruppe wrote:
On Monday, 24 February 2020 at 19:50:23 UTC, JN wrote:
foreach (i; iota(5))
{
printers[i] = () { write(i); };
I know it looks silly but if you make that:
printers[i] = (int i) { return () { write(i); }; }(i);
it will do what you want.
This is something that used to be common in javascript, write a
little function that passes the capture-by-value args and
returns the lambda you actually want and call it immediately.
That extra layer causes the compiler to create a new copy of
the capture variables snapshotted in time.
D'oh! I am actually familiar with the pattern from Javascript,
used it many times, but somehow got it mixed up with something
else and couldn't make it work.
Thanks.
Lambda capture by value
import std.range;
import std.stdio;
alias NumberPrinter = void delegate();
NumberPrinter[int] printers;
void main()
{
foreach (i; iota(5))
{
printers[i] = () { write(i); };
}
foreach (i; iota(5))
{
printers[i]();
}
}
This prints 4 4 4 4 4.
How to make it so that it prints 0 1 2 3 4? Is it possible
without changing the delegate definition to void delegate(int)?
Default value for member class
class IntValue
{
int x = 5;
}
class Foo
{
IntValue val = new IntValue();
}
void main()
{
Foo f1 = new Foo();
Foo f2 = new Foo();
assert(f1.val == f2.val);
}
Is this expected? Or should each Foo have their own IntValue
object? They're equal right now, changing one changes the other.
When exactly is the "new IntValue" happening? On program init, or
when calling new Foo() for the first time?
Re: total newbie + IDE
On Sunday, 9 February 2020 at 13:22:56 UTC, solnce wrote: I really enjoy Pascal having Lazarus. Although it is not perfected, it provides very good start for beginners - native IDE, RAD, easy to setup and adjust, integrated debugger. All that beginners need to have for good start at no time cost. It is just language doesn't evolve itself. There isn't anything comparable to RAD for D. There was one being developed in the days od D1 for the DFL UI library - http://www.dprogramming.com/entice.php , but it's been long dead. You can use GLADE to design an interface and then load it in a GtkD. And it is after 13 years of in active development and being successor (as it claims so) to C++. ADA has it, Eiffel has it, FPC, Gambino many niche and small languages have it, why D, which has much wider application, cannot have it? I think that is natural further evolution of any programming language. I think the text editor/IDE landscape changed a little in last decade or so. Editors such as Sublime Text or Ultraedit lost their popularity, so did small language specific IDEs such as Dev-C++ or Code::blocks. Most of users of these IDEs migrated to the big projects like VSCode, Visual Studio or IntelliJ. Also, the introduction of language servers allows working on IDE support, without being bound to a specific IDE. Editors/IDEs such as VSCode have a massive ecosystem. Why not take advantage of it, rather than start from scratch.
Re: GtkD on Windows: notes + question
On Sunday, 9 February 2020 at 13:28:59 UTC, mark wrote: I found a much easier way to get GtkD working on windows than that described in https://gtkdcoding.com/2019/01/11/-introduction-to-gtkDcoding.html 1. I downloaded and installed the Gtk3 runtime (the link is on https://gtkdcoding.com/2019/01/11/-introduction-to-gtkDcoding.html) 2. I downloaded and unzipped the GtkD3 zip to C:\bin\GtkD3 3. Since I'd already installed LDC I just had to run: dub add-path C:\bin\GtkD3 Now I'm able to build and run on windows using dub. And again, I get static builds so have deployable .exes. However, when I double-click a GtkD .exe it pops up a console window, then the GUI window, and the console window stays until I close the GUI. Is there a way to avoid the console Window, at least for release builds? https://forum.dlang.org/thread/xkvdpdsfzevanucrg...@forum.dlang.org
Re: total newbie + IDE
On Friday, 7 February 2020 at 17:02:18 UTC, solnce wrote: Hi guys, I am total newbie and trying to learn a little bit of programming for personal purposes (web scrapping, small databases for personal use etc.). I've been trying to install any of IDE available, but had no success. [...] Try Visual Studio Code with Code-D extension.
Re: Empty string vs null
On Tuesday, 4 February 2020 at 07:44:08 UTC, mark wrote: Just found this post by Mark Parker that explains: https://forum.dlang.org/post/gvveit$10i5$1...@digitalmars.com I recommend using Nullable from https://dlang.org/phobos/std_typecons.html#Nullable if you want to explicitly allow a non-value. I think it's cleaner and shows the intent better.
Assoc array init
int[int] a = [5: 7];
void main()
{
}
This fails because apparently [5: 7] is a "non-const expression".
How? Why?
Yes, I know I can just init in a static this() section, but that
feels like a bad workaround.
Re: Is there a std.zip.ZipArchive isDir or isFile method?
On Monday, 3 February 2020 at 13:26:38 UTC, mark wrote:
I'm using std.zip.ZipArchive to read zip files, e.g.:
auto zip = new ZipArchive(read(filename));
// ...
foreach (name, member; zip.directory) {
if (name.endsWith('/')) // skip dirs
continue;
mkdirRecurse(dirName(name));
zip.expand(member);
write(name, member.expandedData());
}
As you can see, I am detecting directories with a crude test.
I really wish there was a method for this: and if there is,
could you give me the link 'cos I can't see one in the docs?
(BTW The code above is slightly simplified: the real code won't
unzip if there's an absolute path or .. present and also
ensures that all members are unzipped into a subdir even if the
zip has top-level names.)
ArchiveMember has "flags" field, perhaps it stores if it's a
directory?
If not, fileAttributes will have it but it looks it's OS specific.
Re: bindbc-opengl: Now drawing triangle
On Saturday, 25 January 2020 at 19:52:25 UTC, Luhrel wrote: Hello, I made a simple OpenGL file using bindbc-opengl and glfw (https://pastebin.com/ehmcHwxj) based on https://github.com/SonarSystems/Modern-OpenGL-Tutorials/blob/master/%5BGETTING%20STARTED%5D/%5B1%5D%20Triangle/main.cpp The cpp project compiles and runs fine (g++ main.cpp -lGL -lglfw -o gl_test && ./gl_test), but my d-translated file not: the triangle isn't shown. Do you have any idea ? I assume it's working now? For future, learn to use RenderDoc: https://renderdoc.org/ it allows you to debug your OpenGL application and see what kind of data is sent by your app.
lambda alias import
stuff.d:
alias doStuff = () {};
main.d:
import stuff;
void main()
{
doStuff();
}
DMD throws compile error:
Error 42: Symbol Undefined __D5stuff9__lambda3FNaNbNiNfZv
Is this expected behavior? It tripped me while trying to use
DerelictVulkan :(
Re: How to parse epub content
On Saturday, 11 January 2020 at 12:38:38 UTC, Adnan wrote: How would someone approach parsing epub files in D? Is there any libraries to parse XHTML? XHTML is XML. There are libraries to parse XML, from std.xml in the standard library to libraries like dxml in the package repository.
Re: How load icon from resource using LoadImage?
On Sunday, 5 January 2020 at 13:33:35 UTC, Marcone wrote: I am using this code to load icon from local directory, but I want to load icon from resource.res file: wndclass.hIcon = LoadImage( NULL, "icon.ico", IMAGE_ICON, 0, 0, LR_LOADFROMFILE| LR_SHARED | LR_LOADTRANSPARENT); https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-loadimagea According to the docs, the first argument is NULL only for standalone images, otherwise you have to provide a valid HINSTANCE. By the way, have you managed to add the res file into the binary? My understanding is that the res file should be added into the exe file by the rc command before it can be used.
Re: Unfold string array
On Sunday, 5 January 2020 at 08:21:54 UTC, Teo wrote: All advises are welcome Thank you! For some reason I can't get run.dlang.io to shorten a link... hmm... I'll use ideone. https://ideone.com/EjbhIs It's kind of a naive implementation, there probably is room for improvement but should work for start.
Re: Finding position of a value in an array
On Sunday, 29 December 2019 at 08:31:13 UTC, mipri wrote: int i = a.countUntil!(v => v == 55); assert(i == 2); I also had to ask because I couldn't find it. In other languages it's named "index()", "indexOf()" or "find()". D is the only language I know which uses the "countUntil" scheme. And even so it's not obvious from the name if it's the index of the element or number of preceding elements.
Re: Default values in derived class
On Saturday, 28 December 2019 at 22:12:38 UTC, Johan Engelen wrote: What Mike is saying is that `Base` has one `b` member variable, but `Derived` has two (!). ``` writeln(d.b); // false writeln(d.Base.b); // true (the `b` member inherited from Base) ``` -Johan That makes sense. I think the compiler/linter should be warning against such cases though, because it's easy to make mistakes this way.
Default values in derived class
import std.stdio;
class Base
{
bool b = true;
}
class Derived : Base
{
bool b = false;
}
void main()
{
// 1
Base b = new Derived();
writeln(b.b); // true
// 2
Derived d = new Derived();
writeln(d.b); // false
}
Expected behavior or bug? 1) seems like a bug to me.
Re: What kind of Editor, IDE you are using and which one do you like for D language?
On Sunday, 22 December 2019 at 17:20:51 UTC, BoQsc wrote: There are lots of editors/IDE's that support D language: https://wiki.dlang.org/Editors What kind of editor/IDE are you using and which one do you like the most? This list could use some cleaning up. Some of the IDEs haven't been maintained in a while, and most of them are some obscure editors with basic D syntax highlighting. There should be a link o n the main webpage to a list of recommended IDEs, and the common ones, the ones people are looking for - IntelliJ D Plugin, VisualD, VSCode. Personally I use code-d. Haven't had much luck with the other D VSCode extension.
Re: How use Resedit Dialogs + Dlang?
On Sunday, 15 December 2019 at 04:00:14 UTC, Marcone wrote: There's a way to create simple GUI for Dlang using Resedit? How? Do you know how to do it with C++? It should work the same in D, just use the WinApi bindings for calls.
Re: Dmd install to new Windows 10 system can't run app.d
On Thursday, 21 November 2019 at 09:26:39 UTC, zoujiaqing wrote: On Thursday, 21 November 2019 at 08:42:39 UTC, Seb wrote: Note this line: Running .\myproject.exe Program exited with code -1073741515 Your compiled program is crashing. Could you run the compiled binary manually and obtain a stack trace? Install msvcr100.dll for x64 the question is solved, thanks! https://download.microsoft.com/download/3/2/2/3224B87F-CFA0-4E70-BDA3-3DE650EFEBA5/vcredist_x64.exe I had the same issue a while ago and reported it here https://issues.dlang.org/show_bug.cgi?id=20061
Re: Saving and loading large data sets easily and efficiently
On Monday, 30 September 2019 at 20:10:21 UTC, Brett wrote: So it much more difficult than POD but would still be a little more work to right... hoping that there is something already out there than can do this. It should be I'm afraid there's nothing like this available. Out of serialization libraries that I know, msgpack-d and cerealed don't store references and instead duplicate the pointed-to content. Orange does it, but it doesn't support binary output format, only XML, so it isn't a good fit for your data.
Re: Help playing sounds using arsd.simpleaudio
On Saturday, 28 September 2019 at 03:21:38 UTC, Murilo wrote: Can anyone just please show me how to play a background sound(like those in games) using arsd.simpleaudio? I'd like something simple with a code snippet please. I recommend SoLoud - bindings are available here http://code.dlang.org/packages/bindbc-soloud . It's more powerful than simpleaudio, supports multiple formats, 3D audio, etc.
Interfaces and templates
import std.stdio;
interface IWriter
{
void write(U)(U x);
}
class Foo : IWriter
{
void write(U)(U x, int y)
{
writeln(x);
}
}
void main()
{
}
Does this code make sense? If so, why doesn't it throw an error
about unimplemented write (or incorrectly implemented) method?
Re: Sort Associative Array by Key
On Sunday, 25 August 2019 at 17:01:23 UTC, a11e99z wrote: On Sunday, 25 August 2019 at 16:54:33 UTC, Samir wrote: Is there a way to output the values of an associative array based on the lexicographic order of the keys? For example, if foo = ["VXE":8, "BZP":5, "JLC":2], I'd like to output something like: 5 2 8 auto foo = ["VXE":8, "BZP":5, "JLC":2]; foo.byPair.array.sort!"a[0] I think normal lambdas are better than these string ones: foo.byPair.array.sort!((a, b) => a[0] < b[0]).map!(a => a[1]).writeln;
Re: Can I remove an element from a global associative array from within a class destructor?
On Friday, 2 August 2019 at 23:13:10 UTC, realhet wrote: Today I read the documentation about structs, unions and classes, but I haven't find any restrictions for the ~this() destructors. Is there some extra rules regarding the GC and what I must not do in the destructors? Class destructors are similar to Java's finalizers in behavior. D doesn't give you a guarantee when the class destructor is called and it doesn't give you a guarantee if it will be called at all, so it doesn't really work for RAII-like resource management. If you want RAII-like behavior, either use structs (struct destructors are deterministic), or wrap your class inside a scoped/refCounted wrapper from std.typecons.
Re: Help me decide D or C
On Thursday, 1 August 2019 at 09:43:20 UTC, Kagamin wrote: On Wednesday, 31 July 2019 at 22:30:52 UTC, Alexandre wrote: 1) Improve as a programmer 2) Have fun doing programs Thats it basically. I am planning to study all "free" time I have. I am doing basically this since last year. Try Basic. It has builtin graphics, seeing you program draw is quite fascinating. What variant of Basic? Visual Basic? I think https://processing.org/ is the best if you want to "code with drawing"
D on ARM laptops?
Does anyone know if and how well D works on ARM laptops (such as Chromebooks and similar)? For example this one https://www.pine64.org/pinebook/ . Can it compile D? Obviously DMD is out because it doesn't have ARM builds. Not sure about GDC. How about LDC?
Re: What is iota function full name
On Friday, 21 June 2019 at 09:18:49 UTC, Jonathan M Davis wrote: So, iota is the name of the function, and it doesn't stand for anything. It's just the name of the Greek letter that was used for a similar function in another language that most programmers these days have probably never heard of. - Jonathan M Davis I don't even understand why get so much inspiration from C++. Why not just name it seq or sequence?
Re: Using python in D
On Friday, 7 June 2019 at 05:04:30 UTC, rnd wrote: On Friday, 7 June 2019 at 04:39:14 UTC, rikki cattermole wrote: On 07/06/2019 3:54 PM, rnd wrote: How should I 'initialize python' ? The example is probably a good place to begin. https://github.com/ariovistus/pyd/blob/master/examples/simple_embedded/hello.d Thanks for the link. After putting in missing statements, it started running but reported: exceptions.ImportError: No module named pandas I believe pyd is working on Python2 while I have pandas installed in Python3. How can I specify Python version 3 in pyd? https://github.com/ariovistus/pyd "To use with dub, either specify the relevant subConfiguration for your python version, or run source pyd_set_env_vars.sh python> on linux or pyd_set_env_vars.bat on windows to set the relevant environment variables and use the env subConfiguration."
Static struct?
I noticed a construct I haven't seen before in D when reading the
description for automem - https://github.com/atilaneves/automem
static struct Point {
int x;
int y;
}
What does "static" do in this case? How does it different to a
normal struct?
Re: Unexpected behaviour in associative array
On Friday, 19 April 2019 at 12:37:10 UTC, Arredondo wrote: Here's a reasonably-sized code fragment that demonstrates the issue. I hope the comments along the way are descriptive enough Hmm. Have you tried using a different compiler or 32/64 bit? I had a weird "null out of nowhere" bug going on with associative array some time ago - https://issues.dlang.org/show_bug.cgi?id=19662
Re: What Does @ Mean?
On Monday, 8 April 2019 at 14:19:04 UTC, XavierAP wrote: The only other example of language using @, in an almost but not quite completely different way, is C#. It's also a prefix that allows you to define names that would collide with reserved words, for example string @class = "menu"; Of course you should never do this unless you absolutely need for interop. Java uses @ for annotations too. Pascal uses @ for "address of", like & in D.
Re: Where is GDC being developed?
On Thursday, 21 March 2019 at 08:19:56 UTC, Per Nordlöw wrote: At https://github.com/D-Programming-GDC/GDC/commits/master there's the heading "This repository has been archived by the owner. It is now read-only." Where will the development of GDC continue? I am not exactly sure, but if GDC got merged into GCC, doesn't that mean that any new development will be done on the GCC repository?
Re: Setting the GtkD Include Path in dexed?
On Tuesday, 12 March 2019 at 17:39:06 UTC, Ron Tarrant wrote: Another way of asking this, I suppose, would be: How do I pass command line arguments to dmd from within dexed? How about Project -> Project editor -> Categories -> Other -> dmdOtherOptions ?
Struct destructor
Compare this D code:
import std.stdio;
struct Foo
{
~this()
{
writeln("Destroying foo");
}
}
void main()
{
Foo[string] foos;
foos["bar"] = Foo();
writeln("Preparing to destroy");
foos.remove("bar");
writeln("Ending program");
}
and equivalent C++ code:
#include
#include
#include
using namespace std;
struct Foo
{
~Foo()
{
cout << "Destroying foo" << endl;
}
};
int main()
{
map foos;
foos["bar"] = Foo();
cout << "Preparing to destroy" << endl;
foos.erase("bar");
cout << "Ending program" << endl;
}
C++ results in:
Destroying foo
Preparing to destroy
Destroying foo
Ending program
D results in:
Preparing to destroy
Ending program
Destroying foo
Is this proper behavior? I'd imagine that when doing
foos.remove("bar"), Foo goes out of scope and should be
immediately cleaned up rather than at the end of the scope? Or am
I misunderstanding how should RAII work?
Re: Using arsd.simpledisplay module
On Monday, 25 February 2019 at 23:35:24 UTC, Murilo wrote: I need help with the arsd.simpledisplay module. Is there anyone there who knows about it? I have doubts concerning SimpleWindow.eventLoop(). I'm pretty sure Adam D. Ruppe knows about it since he's the author :) What exactly is the question, what doubts are you having?
Re: How to setup dub to use x86 and x64 dll's when appropriate?
On Tuesday, 26 February 2019 at 04:20:27 UTC, Michelle Long wrote: On Tuesday, 26 February 2019 at 04:17:04 UTC, Michelle Long wrote: e.g., using sdl for different versions and have it automatically switch. What would be nice is if one could stick all the files for x86 in one dir and x64 in the others and they will be used depending on the build(and copied) Ideally one can do it for debug and release versions too. It seems also that dub is shit for swapping between different archs... I added the -m64 flag and then get build errors for lib format errors, compiles fine for x86... Why add -m64 rather than --arch=x86_64? Also: https://github.com/dlang/dub/wiki/Cookbook#creating-windows-package-that-has-32-and-64-bit-dlls
Re: How to call other variadic function with the same arguments?
On Sunday, 24 February 2019 at 13:09:15 UTC, Victor Porton wrote:
Let f be a variadic function:
Result f(...);
How to implement variadic function g which calls f with the
same arguments as one it receives?
Result g(...) {
// ...
}
void f(A...)(A a)
{
foreach(t; a)
writeln(t);
}
void g(A...)(A a)
{
f(a);
}
g(1, 2, 3);
Re: Windows Defender won't let me install DMD
On Monday, 18 February 2019 at 16:32:26 UTC, belkin wrote: Additional question as a beginner. What do I need to install to get started. Obviously I need a compiler (which one is best ). But I also want an IDE and so far it seems Visual D would be a best choice. Ideas? Visual D works well, as does Visual Studio Code with code-d plugin.
Re: Why -I flag does not work?
On Saturday, 9 February 2019 at 08:15:36 UTC, Victor Porton wrote:
Why does -I flag in DFLAGS does not work? (Ubuntu Linux)
I'm no expert on dub, but it's possible that it's overriding the
import path anyway. One of the main points of dub is that you
shouldn't have to handle the import paths yourself.
I think what could work is adding a librdf in dub.json
dependencies section, and then using "dub add-local" command to
point to the library. Something like:
dub add-local /usr/local/include/d/librdf ~master
and then in dependencies section:
"dependencies": {
"librdf": "~master"
}
Re: Tricky DMD bug, but I have no idea how to report
On Friday, 8 February 2019 at 23:30:44 UTC, H. S. Teoh wrote: On Fri, Feb 08, 2019 at 10:45:39PM +, JN via Digitalmars-d-learn wrote: [...] Anyway, I reduced the code further manually. It's very hard to reduce it any further. For example, removing the assignments in fromEulerAngles static method hides the bug. Likewise, replacing writeln with assert makes it work properly too. Pity we couldn't get rid of std.stdio. It's a pretty big piece of code, and there are plenty of places where it may go wrong inside, even though we generally expect that the bug lies elsewhere. Oh well. Hopefully somebody else can dig into this and figure out what's going on. Hmm. I just glanced over the std.stdio code... it appears that somebody has added @trusted all over the place, probably just to get it to compile with @safe. That's kinda scary... somebody needs to vet this code carefully to make sure nothing fishy's going on in there! T I can replace it with core.stdc.stdio if it's any better. Looks like any attempt to do a check for "x is null" hides the bug. I tried assert(), also tried if (x is null) throw new Exception(...)
Re: Tricky DMD bug, but I have no idea how to report
On Friday, 8 February 2019 at 22:11:31 UTC, H. S. Teoh wrote: Pity I still can't reproduce the problem locally. Otherwise I would reduce it even more -- e.g., eliminate std.stdio dependency and have the program fail on assert(obj != null), and a bunch of other things to make it easier for compiler devs to analyze -- and perhaps look at the generated assembly to see what went wrong. If you have the time (and patience) to do that, it would greatly increase the chances of this being fixed in a timely way, since it would narrow down the bug even more so that it's easier to find in the dmd source code. T It seems to be a Windows 64-bit only thing. Anyway, I reduced the code further manually. It's very hard to reduce it any further. For example, removing the assignments in fromEulerAngles static method hides the bug. Likewise, replacing writeln with assert makes it work properly too.
Re: Tricky DMD bug, but I have no idea how to report
On Friday, 8 February 2019 at 21:35:34 UTC, H. S. Teoh wrote: On Fri, Feb 08, 2019 at 09:23:40PM +, JN via Digitalmars-d-learn wrote: [...] I managed to greatly reduce the source code. I have filed a bug with the reduced testcase https://issues.dlang.org/show_bug.cgi?id=19662 . Haha, you were right! It's a compiler bug, another one of those nasty -O -inline bugs. Probably a backend codegen bug. Ran into one of those before; was pretty nasty. Fortunately it got fixed soon(ish) after I made noise about it in the forum. :-P T Luckily it's not a blocker for me, because it doesn't trigger on debug builds, and for release builds I can always use LDC, but still it's bugging me (pun intended).
Re: Tricky DMD bug, but I have no idea how to report
On Friday, 8 February 2019 at 09:30:12 UTC, Vladimir Panteleev wrote: On Friday, 8 February 2019 at 09:28:48 UTC, JN wrote: I will try. However, one last thing - in the example test scripts, it runs first with one compiler setting (or D version) and the second time with the other compiler setting (or D version). But it looks like the exit code of the first run is ignored anyway, so why run it? With "set -e", the shell interpreter will exit the script with any command that fails (returns with non-zero status), unless it's in an "if" condition or such. I'll update the article to clarify it. I see. Dustmite helped. I had to convert it to windows batch, so my testscript ended up to be: dmd -O -inline -release -boundscheck=on -i app.d -m64 @IF %ERRORLEVEL% EQU 0 (ECHO No error found) ELSE (EXIT /B 1) @app | FINDSTR /C:"Object" @IF %ERRORLEVEL% EQU 0 (ECHO No error found) ELSE (EXIT /B 1) dmd -O -inline -release -boundscheck=off -i app.d -m64 @IF %ERRORLEVEL% EQU 0 (ECHO No error found) ELSE (EXIT /B 1) @app | FINDSTR /C:"null" @IF %ERRORLEVEL% EQU 0 (EXIT /B 0) ELSE (EXIT /B 1) I managed to greatly reduce the source code. I have filed a bug with the reduced testcase https://issues.dlang.org/show_bug.cgi?id=19662 .
Re: Tricky DMD bug, but I have no idea how to report
On Friday, 8 February 2019 at 07:30:41 UTC, Vladimir Panteleev wrote: On Thursday, 7 February 2019 at 22:16:19 UTC, JN wrote: Does it also work for dub projects? It will work if you can put all the relevant D code in one directory, which is harder for Dub, as it likes to pull dependencies from all over the place. When "dub dustmite" is insufficient (as in this case), the safest way to proceed would be to build with dub in verbose mode, take note of the compiler command lines it's using, then put them in a shell script and all mentioned D files in one directory, then pass that to Dustmite. I will try. However, one last thing - in the example test scripts, it runs first with one compiler setting (or D version) and the second time with the other compiler setting (or D version). But it looks like the exit code of the first run is ignored anyway, so why run it?
Re: Tricky DMD bug, but I have no idea how to report
On Thursday, 7 February 2019 at 03:50:32 UTC, Vladimir Panteleev wrote: On Monday, 17 December 2018 at 21:59:59 UTC, JN wrote: while working on my game engine project, I encountered a DMD codegen bug. It occurs only when compiling in release mode, debug works. Old thread, but FWIW, such bugs can be easily and precisely reduced with DustMite. In your test script, just compile with and without the compiler option which causes the bug to manifest, and check that one works and the other doesn't. I put together a short article on the DustMite wiki describing how to do this: https://github.com/CyberShadow/DustMite/wiki/Reducing-a-bug-with-a-specific-compiler-option Does it also work for dub projects? Anyway, I managed to reduce the source code greatly manually: https://github.com/helikopterodaktyl/repro_d_release/ unfortunately I can't get rid of the dlib dependency. When built with debug, test outputs [0: Object], with release it outputs [0: null]. commenting this line out: f.rotation = Quaternionf.fromEulerAngles(Vector3f(0.0f, 0.0f, 0.0f)); or changing it to: f.rotation = Quaternionf.identity(); is enough to make release output [0: Object] as well. I guess dlib is doing something dodgy with memory layout, but I can't see anything suspicious :(
Re: Tricky DMD bug, but I have no idea how to report
On Wednesday, 6 February 2019 at 22:22:26 UTC, H. S. Teoh wrote: Of course, I've no clue whether this is the cause of your problems -- it's just one of many possibilities. Pointer bugs are nasty things to debug, regardless of whether or not they've been abstracted away in nicer clothing. I still remember pointer bugs that took literally months just to get a clue on, because it was nigh impossible to track down where they happened -- the symptoms are too far removed from the cause. You pretty much have to take a wild guess and get lucky. They are just as bad as race condition bugs. (Once, a race condition bug took me almost half a year to fix, because it only showed up in the customer's live environment and we could never reproduce it locally. We knew there was a race somewhere, but it was impossible to locate it. Eventually, by pure accident, an unrelated code change subtly altered the timings of certain things that made the bug more likely to manifest under certain conditions -- and only then were we finally able to reliably reproduce the problem and track down its root cause.) T I am not sure if it's a pointer bug. What worries me is that it breaks at the start of the program, but uncommenting code at the end of the program influences it. Unless there's some crazy reordering going on, this shouldn't normally have an effect. I still believe the bug is on the compiler side, but it's a bit of code in my case, and if I try to minimize the case, the issue disappears. Oh well.
Re: Tricky DMD bug, but I have no idea how to report
On Tuesday, 18 December 2018 at 22:56:19 UTC, H. S. Teoh wrote: Since no explicit slicing was done, there was no compiler error / warning of any sort, and it wasn't obvious from the code what had happened. By the time doSomething() was called, it was already long past the source of the problem in buggyCode(), and it was almost impossible to trace the problem back to its source. Theoretically, -dip25 and -dip1000 are supposed to prevent this sort of problem, but I don't know how fully-implemented they are, whether they would catch the specific instance in your code, or whether your code even compiles with these options. T No luck. Actually, I avoid in my code pointers in general, I write my code very "Java-like" with objects everywhere etc. I gave up on the issue actually, perhaps I am encountering this bug https://issues.dlang.org/show_bug.cgi?id=16511 in my own code. Anyway, 32-bit and 64-bit debug work, so does LDC. That's good enough for me.
Re: crashing with no stack trace, why?
On Thursday, 31 January 2019 at 11:09:56 UTC, DanielG wrote: However it was simply crashing with an exit code (-1073740771 / 0xC41D), and I was having a heck of a time trying to debug on Windows. (Shoutout to the revamped WinDbg Preview, couldn't get anything else to work!) For Windows, you can try VisualD and VSCode with C++ debugger. I had good experience using those, at least to determine which line crashes in my code when stacktrace is not provided.
Re: How to disable/hide constructor when using factory method?
On Thursday, 24 January 2019 at 12:52:47 UTC, Arafel wrote:
You are declaring the constructor, but not defining it, i.e.
you're telling the compiler that it's in some other compilation
unit.
The compiler won't complain, but the linker will.
If you replace:
[...]
with:
[...]
it should work.
A.
On 1/24/19 1:48 PM, JN wrote:
[...]
Doh. Of course. I feel so dumb. I just had it at @disable
this();, then replaced @disable with private without thinking to
add {}
Re: How to disable/hide constructor when using factory method?
On Wednesday, 23 January 2019 at 19:41:44 UTC, Alex wrote:
On Wednesday, 23 January 2019 at 19:26:37 UTC, JN wrote:
class Foo
{
static Foo makeFoo()
{
Foo f = new Foo();
return f;
}
}
void main() {
Foo f = Foo.makeFoo();
}
For a code like this. I'd like all users of the class to be
forced to create instances using the static method makeFoo. I
want to disallow "new Foo()". But I don't know if it's
possible to disable the constructor, while still making it
available in the makeFoo static method.
@disable this doesn't work, private this(); doesn't work
either.
private should work, if the class and the main are in different
modules, no?
I expected that too, but it doesn't even work in the same module.
class Foo
{
private this();
static Foo makeFoo()
{
Foo f = new Foo();
return f;
}
}
void main() {
}
fails with:
onlineapp.o:onlineapp.d:_D9onlineapp3Foo7__ClassZ: error:
undefined reference to '_D9onlineapp3Foo6__ctorMFZCQzQr'
onlineapp.d:7: error: undefined reference to
'_D9onlineapp3Foo6__ctorMFZCQzQr'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
I don't understand why is this a linker problem. My understanding
is that for some reason static methods don't have access to the
private constructor (they're not considered same module?). But
even though, it should error with something like "Foo.makeFoo()
cannot access private Foo.this()" rather than fail at linking.
How to disable/hide constructor when using factory method?
class Foo
{
static Foo makeFoo()
{
Foo f = new Foo();
return f;
}
}
void main() {
Foo f = Foo.makeFoo();
}
For a code like this. I'd like all users of the class to be
forced to create instances using the static method makeFoo. I
want to disallow "new Foo()". But I don't know if it's possible
to disable the constructor, while still making it available in
the makeFoo static method.
@disable this doesn't work, private this(); doesn't work either.
